NonStop Server for Java 6.0 Programmer's Reference

NOTE: If the JREHOME environment variable is set, Java installed in the location pointed by

$JREHOME directory will take precedence.

• The Dnsk.java.fastExec=true option reduces the latency of the Java

Runtime.exe()API, which isused to spawn a child process.

• The Dynamic saveabend file creation feature helps to create a saveabend file of a running

Java process without aborting the Java process. Thus, the Java process continues normal

execution after a short pause, during which the saveabend file is created.

• The -XX:ThreadTimeSlice[=T] option specifies the time slice for JVM-forced preemptive

thread scheduling.

• The -XX:EnableCompilerSafepoints option improves the Garbage Collection

performance of an application on systems running J-series.

NOTE: The -XX:EnableCompilerSafepoints option must not be used if the application

uses a selectable segment.

Documentation Changes

The documentation changes are:

• Updated information on the JREHOME environment variable in the following sections:

“Verifying the Java Installation” (page 32)◦

◦ “ENV” (page 35)

• Added a note on the JREHOME variable in the “JREHOME” (page 39) section.

• Updated the “Calling Java Methods from C or C++” (page 45) section.

• Added information on the XX:ThreadTimeSlice option in the “Multithreaded Programming”

(page 47) section.

• Added a note on the “Preemptive User Threads On NonStop Server For Java” (page 52)

feature.

• Added the following sections:

“Dynamic Saveabend File Creation” (page 52)◦

◦ “Creating Child Process Using the -Dnsk.java.fastExec=true Option” (page 52)

◦ “GC Log Rotation” (page 78)

• Updated the procedure required to set up monitoring for a live Java applications in the

“Monitoring live Java applications” (page 76) section.

• Added a note on GC log rotation in the “Analyzing Garbage Collection Data” (page 79)

section.

• Provided references to the HPjmeter 4.0 User's Guide in the appropriate sections.

• Replaced 'Appendix B: Addendum to HPjmeter 3.1 Users Guide' with 'Appendix B: Addendum

to HPjmeter 4.0 Users Guide'.

Changes added to this revision part number 546595-001 are:

• “Feature Changes” (page 11)

• “Documentation Changes” (page 12)